It’s founder said unwanted gifts waste billions of dollars every year — this is meant to save time and money.

“People find that actually having an idea of what a child needs or wants seems to far beat the idea of settling for a gift card or racking their brains, or buying the wrong size,” Giftster founder Ron Reimann said.

The Dolphin Book Shop in Port Washington is one of the many toy stores bucking the trend, because the owner said the art of giving is about putting thought into the perfect gift.

“It’s not a reflection of you. It’s not you giving to them, it is just fulfilling a need or an interest,” Judith Mitzner said.

“Getting a gift that you want has nothing to do with people putting thought into it, and caring you. It’s about the convenience, and it’s about your desires being met instantly, with no hard work,” she said.

Etiquette experts said they get the convenience factor, but a kid’s birthday party can be a teaching moment — that gifts are supposed to be about giving, not getting.

A Princeton University economist estimated that $4-billion is spent on unwanted gifts each year.